Post base



FIG. 1 is a top perspective view of my post base;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevation thereof, where the rear, left-hand side and right-hand side elevations are identical; and,

FIG. 5 is a bottom plan view of thereof. 

The ornamental design for a post base, as shown and described. 